SAN FRANCISCO — The latest in a series of Pacific Ocean storms pounded California with rain and snow Thursday, prompting officials to put communities on alert for mudslides and flooding and making travel treacherous. Runoff flowed from the San Francisco Bay Area to the Sierra Nevada foothills and from Central Coast counties to Los Angeles and the inland region to the east. Blizzard conditions blanketed the higher elevations of the Sierra Nevada with snow while high surf rolled ashore along the coast. Concern was high in communities near burn scars of recent wildfires. The Santa Barbara County community of Montecito that was devastated by a deadly debris flow a year ago received 1.5 inches (3.8 centimeters) of rain in 24 hours, but had so far avoided a repeat of the disaster. A flash flood watch was in effect for the area burned by the wildfire that obliterated the Northern California town of Paradise in November. Areas under evacuation orders included parts of fire-scarred Malibu, where all public schools were closed.